import Vue from 'vue'
import VueRouter from 'vue-router'
import login from '../components/login.vue'
import home from '../components/home.vue'

Vue.use(VueRouter)

const routes = [
  {
    path: '/',
    redirect: '/login'
  },
  {
    path: '/login',
    component: login
  },
  {
    path: '/home',
    component: home
  }
]

const router = new VueRouter({
  routes
})

// 挂载路由导航守卫
router.beforeEach((to, from, next) => {
  // to 表示将要访问的路径
  // from 表示从哪个路径跳转而来
  // next 是一个函数，next()表示放行,next('/login')表示强制跳转到/login
  // 登录页无条件放行
  if (to.path === '/login') {
    next()
  }
  // 其他页面需要查看是否有token
  const tokenStr = window.sessionStorage.getItem('token')
  if (!tokenStr) {
    return next('/login')
  } else {
    next()
  }
})
export default router
